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C. W. SAALBURG.

METHOD OF TRANSFERRING CARBON TISSUE PRINTS.

APPLICATION FILED FEB-27,1911.

menma July 1, 1919.

IN l/EA/ TOR A TTORA/E Y CJBEES W. SBURG, F RICHMOND HILL, NEW YORK,ASSIGNOR T0 MULTICOLU' INTAGLIO JESS COMPANY, OF NEW YORK, N. "Y ACORPORATION OF DELAW 11: v

METHOD OF TRANSEERRING- CARBON-TISSUE PRINTS.

Specification of Letters Patent.

Patented duly f, lQIil.

Application filed February 27. 1am Serial No. mace.

and State of New York, have invented cer-' tain new and usefulImprovements in Methods of Transferring Carbon-Tissue Prints,

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of whichthe following is a specification.

This invention relates to a methodoftransferringphotographically-sensitizedcarbon-tissue prints to copperor other etchable surfaces, and especially to those of rolls that are tobe etched and used in multicolor printing. The object of the inventionisto 1mprove the development of the gelatinous content of the face of saidtissue prints, to transfer them without air blisters, wrinkles, orstretching or shrinkage in so far as is possible, so that they will insettino on the surface to be etched be smooth thereon; and to moistentheir paper backs when they have set, in such wise that when such backsare stripped oh the stripping will not so disturb the gelatinous facesof the tissue; printsv or the photographic images thereln contained asto impair correct development.

lln the accompanying drawings forming a part hereof and illustrating myinvention in the best mode now known tome,

Figure l is a plan view of a layout mount of any suitable material onwhich are shown a plurality of photographically-sensitized carbon-tissueprints, each marginally secured by one of its safety margins to themount, and with its face of gelatinous content outward. This view showsthe mount provided on its upper face with projecting gum med tabs theupper or face sides of which are gummable to the surface to be etched.

Fig. 2 is an end view. of a copper roll to be etched and of a squeegeeroll, the layout mount having its print-carrying face opposed to thecopper roll surface, and being temporarily attached thereto by. theproject-' ing tabs; and the prints having their faces of elatinouscontent opposed to the copperrol surface. The view also indicates aspraying device.

Fig. 3 is a top plan view of a simple form of apparatus useful inpractising this method.

Referring to the drawings, 1 is a coppersurfaced roll to be etched. ftis indicated as revoluble in an end bearing for its man drel 2. Inpractice a suitable apparatus will have two bearings 3, one for eachman-- drel end. A revoluble squeegee roll 4; is Indicated as extendinglengthwise along the upper periphery of the copper roll with its axisrearward of the axis of the copper roll. llnpractice the apparatus willhave two bearings, one for each end of the copper roll. The squeegeeroll works as an idler. lts bearings are indicated by 5. A crank handle6 is provided for the copper roll.

in practising my method lay out on a. preferably non-stretchable sheetmount-7 of endable material such as good strong smooth-surfaced paper ofsomewhat waterabsorbent character, any desired number of lidphotographically sensitized carbon tissue prints 8 secwring each ofsuch. prints by its upper safety margin by dabs 9 of fish glue or othermaterial easily soluble in water,

to the mount. 'lhe backs of the prints are I opposed to the mount, theupper back margm of which I show provided with rogecting tabs 10corresponding ends of w ich are. gummed to the back margin of the mountand project away from the edge thereof. Each tab 10 is gummed on itsfront projecting face at Ill.

The mount is rectangular or at least is cut with its upper oradvancing'edge 12 straight, and this straight edge of the mount iscarefully alined with a suitable guidemark or ids-marks 13 which may. bea series of a ined pencil marks on the copper roll. At leastfone of theside edges 14 of the mount is made at right-angles to the advancing edge12, and the copper roll is provided with a suitable guide-mark 15 whichextends peripherally and is at rightthe copper roll, the prints and themount in the hot water. This loosens'up the mount at its points ofattachment to the copper roll and also loosens up the mount from thebacks of the prints by dissolving the glue; and therefore strip 03d" themount and then strip of the paper backs of the prints, leavlOO llmi

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ing on the copper roll merely the gelatinous films to be, developed. Forother rolls of the series corresponding prints are secured to the samemount or other mounts in exactly the same positions that the firstseries of prints has on its mount; and thereby I effect accurateregistration of each cooperating print, one with another, in a series ofetchable rolls for different colors.

The mount shown is provided with a series of location marks 15 of anysuitable kind to serve as guides in location on the same mount or on aseries of mounts of duplicate prints; and all the mounts for a givenseries are to have the guide-marks similarly placed on them.

If the apparatus indicated is used, I turn the copper roll, the squeegeeroll being an idler, until the upper or advancingmargin of the mount isnipped by the squeegee roll and nipped and held in place not only by theweight of the squeegee roll, but also by the adhesive tab ends 11sticking to the copper roll. By safety margins of carbontissue prints ismeant that such margins do not contain any portion of the photographicimage therein that it is desired to etch.

'There are many other ways of positioning the gelatinous face or facesof the photovgraphically sensitized carbon-tissue print or prints inopposition to an etchable surface, and it or they may be held in placeby hand. but if manually manipulated the chances are that in gettmg aseries of etchable rolls ready for etching there will be so many errorsthat ultimate essential registration will be defeated. My process, whileapplicable to a single roll for monocolor printing, is neverthelessparticularly directed to multicolor printing, and the prints on themount will be duplicated for the other rolls.

Having thus positioned the mount with its temporarily attachedphotographicallysensitized carbon-tissue prints in fixed alinementrelatively to the axis of the roll, I lift the mount and the theretoattached carhon-tissue print or prints away from the copper roll asshown in Fig. 2, except at the n1p between the copper and squeegeerolls; and I carefully spray cool water into the bight or angular spacebetween the oppos- 1ng surfaces of the copper roll and lifted mount andprints for the purpose of softenlng the gelatinous content of the printfaces and making them adhesive. For the purpose of so gently and finelysprayingthe Water, the spray pipe 18 is provided with a serles ofalined-very small pinholes 19 close to one .another. One end of the pipeis plugged at 20 and the other end is connectible to awater-supply pipe,not shown, for brlngingwater under head into the spray pipe.

During such moistening step in which flooding of the carbon tissueprints and mount is avoided, and as the gelatinous faces of the printsbecome sticky, I squeegee the prints in place on the copper roll byturning it and subjecting the backs of the prints to the pressure of thesqueegee roll indirectly through the mount which I prefer generally tokeep in place until the prints themselves have been smoothly squeegeedon the copper roll. I give the latter preferably only one turn.

If the paper backs of the carbon-tissue prints have become much wet inapplying water into the bight mentioned, I carefully wipe them dry for Ifind that for the best results it is highly desirable to develop thegelatinous face of the prints into an adhesive condition without anysoaking of the paper back of the print, as such soaking of the paperback tends to cause it to stretch or wrinkle in drying and thereby toshrink or stretch or wrinkle the photographicallysensitized facematerial of the print which has the gelatinous content and also containsthe photographic image. The waterabsorbing mount acts as a blotter andhelps in keeping the paper print backs relatively dry. It is for thisreason that an important step of my method is to soften the print facewith the least possible wetting of the paper back of the print, andthereby to complete the transfer operation in a minimum of time in orderto diminish the risk of shrinkage or stretch of the tissue.

I prefer to apply a very fine and delicate spray uniformly into saidbight, using as small an amount of moisture as requisite for developmentof the gelatinous content into adhesive condition. The carbon-tissueprint is delicate to handle under the best of circumstances, and when ithas an embedded photographic image the required delicacy of treatment isenhanced. Such photographically-sensitized carbon-tissue prints, whenmoistened and squeegeed in place are liable to stretch and when they drythey are liable 110 to shrink, and they are also liable to wrinkles andblisters and devils, as is well known to all skilled in the art.Moreover such prints, or the material of which they are composed, aresubject to peculiar variations 115 in part and in whole due to naturalvariations in temperature and hygrometric conditions.

What I claim is:

1. The process of transferring photo- 12 graphically sensitizedcarbon-tissue prints having face material of gelatinous content on apaper back, to the periphery of an etchable roll to be etched andsubsequently used as a printing roll, consisting in attach- 125 ing sucha sensitized carbon-tissue print to a flexible mount with the back ofthe print opposed to the mount; in securing a margin of the mount to theetchable roll with the face of the print in position to contact with 1 0the roll; in moistening the face of the print to develop adhesiveness inthe face; in progressively squeegeeing the mount and print on theetchable roll by the rolling pressure of a roll parallel to the etchableroll and by such progressive pressure transferring the print to theetchablev roll; in removing said pressure; in detaching the mount fromthe etchable roll and from the print back; and in detaching the paperback of the print.

2-. The process of preparing a series of multicolor etched printingrolls for use in a printing press, consisting in providing each of aseries of etchable printing press rolls with marks for obtainingregistration of a series of etchings for successive colors; intransferring to each of said'rolls and so positioning thereon by the aidof such marks,

a carbon tissue print having a gelatinous face and a paper back, withits gelatinous ration of the gelatinous material; in subjecting theadhesive rint so located to a progressive pressure t at molds it withoutedgewise displacement. on. the roll; in stripping ofi the paper back;and in acidizing I each of the series of prints to produce a series ofetchings for diiferent colors, one etching on one and another on anotherroll of the series of printm rolls.

In testimony whereo I have hereunto set a my hand this 16th day ofFebruary, 1917.

CHARLES w. SAALBURG.

